Rainbow-electronics W90P710CDG Manual do Utilizador descarregar pdf (Página 503)

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W90P710CD/W90P710CDG

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6.21.2 Register Description

Keypad Controller Configuration Register (KPI_CONF)

KPICONF 0xFFF8_8000 R/O key pad configuration register 0x0000_0000

31 30 29 28 27 26 25 24

RESERVED

23 22 21 20 19 18 17 16

RESERVED

ENCODE

ODEN KPSEL ENKP KSIZE

15 14 13 12 11 10 9 8

DBTC

7 6 5 4 3 2 1 0

PRESCALE

BITS DESCRIPTION

[31:22] RESERVED

[21] ENCODE

Enable Encode Function

If an auxiliary 8 to 3 encoder is used to minimize keypad interface

pin counts, user can connect encoder data to KPCOL[2:0] and

indicator flag (low active) to KPCOL[3].

1 = enable encoder function

0 = default. (8 column inputs)

[20] ODEN

Open Drain Enable

If there are more than one key are pressed in the same column, then

“short-circuit” will appear between active scan and inactive scan row.

Software can set this bit HIGH to enable scan output KPROW[3:0]

pins work as “open-drain” to avoid the “short-circuit”.

1 = Open drain

0 = push-pull driver

[19] KPSEL

Key pad select

W90P710 provide two interfaces for keypad function. Software

should set this bit to select which interface is used to connect

keypad matrix.

1 = pin#23 ~#34 is used as keypad interface

0 = pin #81~88 and #19,#20 are used as keypad interface

1 2 ... 498 499 500 501 502 503 504 505 506 507 508 ... 551 552

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